The companies like Sphera & Ensim which are responsible for licensing the splitting of the big physical server to affect virtualization only and are not involved in any type of web hosting services. There is also available the services of the splitting software through open source called FreeVSD project. The virtualization software has revolutionized the vps hosting services bringing economy within reach of many progressive small clients who considering their level of activities on the online marketing feel the need of virtual private server because their expansion in their services has made shared web hosting redundant and dedicated web hosting is not within their reach.
To know more what Ensim Instant Server Technology is permitting to the hosting service is for slicing the physical server into large numbers of virtual or so called privately web hosted systems. Each such system is a private server having own uniquely created file system, part of physical server disk space, user space with the inclusion of virtual root, process space, CPU, allocated bandwidth, and allocated memory.
Isolation of Performance: The presence of Heavy traffic or overloaded one CPU is not affecting other private servers present on the same box, there are limitations on its CPU, its Memory and processing activities as allocated by vps hosted account.